package com.ljy.myrule;


import com.netflix.client.config.IClientConfig;
import com.netflix.loadbalancer.AbstractLoadBalancerRule;
import com.netflix.loadbalancer.ILoadBalancer;
import com.netflix.loadbalancer.Server;
import java.util.List;
import java.util.concurrent.ThreadLocalRandom;
/**
 * @author ljy
 * @create 2020-11-02-11:58
 */

public class LanRandomRule extends AbstractLoadBalancerRule {
    private int total = 0; //被调用的次数
    private int currentIndex = 0; //当前是谁提供的服务
    //@SuppressWarnings({"RCN_REDUNDANT_NULLCHECK_OF_NULL_VALUE"})
    public Server choose(ILoadBalancer lb, Object key) {
        if (lb == null) {
            return null;
        }
        else {
            Server server = null;

            while (server == null) {
                if (Thread.interrupted()) {
                    return null;
                }
                List<Server> upList = lb.getReachableServers();
                List<Server> allList = lb.getAllServers();
                int serverCount = allList.size();
                if (serverCount == 0) {
                    return null;
                }
                //int index = this.chooseRandomInt(serverCount);
                //server = upList.get(index);
                if (total < 5) {
                    server = upList.get(currentIndex);
                    total++;
                }
                else {
                    total = 0;
                    currentIndex++;
                    if (currentIndex > upList.size() - 1) {
                        currentIndex = 0;
                    }
                    server = upList.get(currentIndex);
                }
                if (server == null) {
                    Thread.yield();
                }
                else {
                    if (server.isAlive()) {
                        return server;
                    }
                    server = null;
                    Thread.yield();
                }
            }
            return server;
        }
    }
    protected int chooseRandomInt(int serverCount) {
        return ThreadLocalRandom.current().nextInt(serverCount);
    }

    public Server choose(Object key) {
        return this.choose(this.getLoadBalancer(), key);
    }

    public void initWithNiwsConfig(IClientConfig clientConfig) {
    }
}

